#pragma once 

#include <iostream>
#include <cstdlib>
#include <unistd.h>
#include <cstring>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <pthread.h>
#include "log.hpp"


//#define PORT 8081
#define BACKLOG 5

class TcpServer
{
  private:
    int port;
    int listen_sock;
    static TcpServer *svr;

    TcpServer(int _port):port(_port),listen_sock(-1)
    {}

    TcpServer(const TcpServer &s){}
  public:
    static TcpServer *getinstance(int port) //单例
    {
      static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
      if(nullptr == svr)
      {
        pthread_mutex_lock(&lock);
        if(nullptr == svr)
        {
          svr = new TcpServer(port);
          svr->InitServer();
        }
        pthread_mutex_unlock(&lock);
      }
      return svr;
    }

    void InitServer()
    {
      Socket();
      Bind();
      Listen();
      LOG(INFO, "tcp_server init  ...  success");
    }

    void Socket()
    {
      listen_sock = socket(AF_INET, SOCK_STREAM, 0);
      if(listen_sock < 0){
        LOG(FATAL, "socket error!");
        exit(1);
      }
      int opt = 1;
      setsockopt(listen_sock, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));//复用
      LOG(INFO, "create socket ... success !");
    }

    void Bind()
    {
      struct sockaddr_in local;
      memset(&local, 0, sizeof(local));
      local.sin_family = AF_INET;
      local.sin_port = htons(port);//主机转网络字节序列
      local.sin_addr.s_addr = INADDR_ANY; // 云服务器不呢直接绑定公网IP

      if(bind(listen_sock, (struct sockaddr*)&local, sizeof(local)) < 0)
      {
        LOG(FATAL, "bind error!");
        exit(2);
      }
      LOG(INFO, "Bind socket ...  successful");
    }

    void Listen()
    {
      if(listen(listen_sock, BACKLOG) < 0)
      {
        LOG(FATAL, "listen socket error!");
        exit(3);
      }
      LOG(INFO, "listen socket ... success");
    }

    int Sock()
    {
      return listen_sock;
    }

    ~TcpServer()
    {
       if(listen_sock >= 0) close(listen_sock);
    }
};

//静态成员类外初始化
TcpServer* TcpServer::svr = nullptr; 

